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For #ThinSectionThursday, here's a beautiful silica undersaturated "Essexite" containing sector- and oscillatory-zoned titanaugite phenocrysts, together with olivine and nepheline (XPL) [Crawfordjohn, Scotland] pic.twitter.com/ilqkmU3czU

— Danny Stubbs (@Danny_Stubbs) November 14, 2019

via Twitter https://twitter.com/Danny_Stubbs

November 14, 2019 at 10:15PM